python - Django:不可散列类型: 'list'

Question

我的函数片段，

它只是从 Django 查询集对象中获取并转换为列表以使用 itemgetter 和 itertools 方法删除重复项，如 python remove duplicate dictionaries from a list

   hc = HomeContractorDetails.objects.filter(category=domain_obj.category,city__icontains=domain_obj.city).values(*args)
    _arg = list(args)
    _arg.remove('id')
    hc = list(hc)
    print _arg,hc

    n= hc.sort(key=operator.itemgetter(_arg))

上述 STMT 的错误

['con_name', 'rating', 'review_no'] [{'rating': u'4.32', 'review_no': u'51', 'id': 3781, 'con_name': u"Carter's Mechanical, Inc."}, {'rating': u'4.02', 'review_no': u'29', 'id': 3782, 'con_name': u'All Mechanical Plumbing & Heating, Inc.'}, {'rating': u'4.17', 'review_no': u'5', 'id': 3783, 'con_name': u'Marcelo Construction'}, {'rating': u'4.63', 'review_no': u'34', 'id': 3784, 'con_name': u'Jay Ell Plumbing and Heating Company, Inc.'}, {'rating': u'4.94', 'review_no': u'24', 'id': 3785, 'con_name': u'Franco Belli Plumbing and Heating and Sons, Inc.'}]

File "/home/gridlex/workspace/HA/article/views.py" in fetch_contractor_tables
      213.     n= hc.sort(key=operator.itemgetter(_arg))

    Exception Type: TypeError at /article/top-rated-plumbing-contractors-in-new-york
    Exception Value: unhashable type: 'list'

变量 hc 打印 dict 值列表。但我无法使用 itemgetter keyfunc 进行排序。

你能帮我确定这个问题吗？

Answer 1

你忘了展开。

n = hc.sort(key=operator.itemgetter(*_arg))